# What amp should i get

#### turb00

##### CarAudio.com Newbie
I’m buying a skar 12” sub and i dont know what amp to buy with it
400w rms
1 ohm

#### winkychevelle

##### CarAudio.com Veteran
10+ year member
D4s jp8 turned down.

OP

#### turb00

##### CarAudio.com Newbie
D4s jp8 turned down.
how far should i turn it down?
sorry for the questions but this is all brand new to me

10+ year member

Ridinhi

#### winkychevelle

##### CarAudio.com Veteran
10+ year member
how far should i turn it down?
sorry for the questions but this is all brand new to me

Use a volteter set to ac voltage on the speaker outputs without the speaker hooker up and use this formula
Volts(ac)=√(watt×ohm)
20(VAc)=√(400×1)
Set the amp to 20v ac on the amps output. Adjust the gain until it's at 20v ±1v

Matts175
OP

#### turb00

##### CarAudio.com Newbie
Use a volteter set to ac voltage on the speaker outputs without the speaker hooker up and use this formula
Volts(ac)=√(watt×ohm)
20(VAc)=√(400×1)
Set the amp to 20v ac on the amps output. Adjust the gain until it's at 20v ±1v
so for my car it would be 12v+_1v because i have a 12 volt battery?

#### winkychevelle

##### CarAudio.com Veteran
10+ year member
so for my car it would be 12v+_1v because i have a 12 volt battery?

No you would put the multi meter leads into the amps speaker terminals and set the gain knob to 20v AC not DC

This has nothing to do with the cars charging voltage.

OP

#### turb00

##### CarAudio.com Newbie
No you would put the multi meter leads into the amps speaker terminals and set the gain knob to 20v AC not DC

This has nothing to do with the cars charging voltage.
ok so then that will turn the amp down so that i can use it with the sub

#### winkychevelle

##### CarAudio.com Veteran
10+ year member
Yes
ok so then that will turn the amp down so that i can use it with the sub
That will set the output to 400w any any extra eq will just eat into the headroom which is fine. The sub should take slightly more than RMS power without issue. Then later you can upgrade to a larger sub if wanted and still have power to spare

5,000+ posts
10+ year member

OP

#### turb00

##### CarAudio.com Newbie
would you recommend this over the d4s jp8?

OP

#### turb00

##### CarAudio.com Newbie
Yes

That will set the output to 400w any any extra eq will just eat into the headroom which is fine. The sub should take slightly more than RMS power without issue. Then later you can upgrade to a larger sub if wanted and still have power to spare
ok i understand it now thank you so much for your help

#### audiobaun

##### CarAudio.com Veteran
5,000+ posts
10+ year member
would you recommend this over the d4s jp8?
I would recommend this over the DFS JP8 for the money, or spend \$10 more than the DFS JP8 and grabb a 1500.1

#### audiobaun

##### CarAudio.com Veteran
5,000+ posts
10+ year member
would you recommend this over the d4s jp8?
For the sub you want to run.. The 700.1 will be more than enough power and enough Head room for that sub. For the Price? And the sub you are wanting to run? Yes.. I would choose this amp

turb00

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